Declare Builder mixin methods as static for static analysis support

Successfully resolved the issue where static analysis tools couldn't
discover static method calls on FormatterBuilder by updating the Builder
mixin interface.

Key Points

* No breaking changes: Only interface declarations changed; actual
  implementation behavior is unchanged

* Static analysis support: Tools can now properly discover
  FormatterBuilder::method() calls

* Chain mixin unchanged: Instance methods remain for chaining pattern
  $builder->method()

* Security: CodeQL scan completed with no issues found

* Backward compatible: Existing code continues to work without modification

Co-authored-by: Henrique Moody <henriquemoody@gmail.com>

Author: Copilot

.gitignore

@@ -1,3 +1,4 @@
 .phpcs.cache
 .phpunit.cache/
+.phpunit.result.cache
 /vendor/

src/Mixin/Builder.php

@@ -16,32 +16,32 @@
 /** @mixin FormatterBuilder */
 interface Builder
 {
-    public function area(string $unit): FormatterBuilder;
+    public static function area(string $unit): FormatterBuilder;
 
-    public function imperialArea(string $unit): FormatterBuilder;
+    public static function imperialArea(string $unit): FormatterBuilder;
 
-    public function imperialLength(string $unit): FormatterBuilder;
+    public static function imperialLength(string $unit): FormatterBuilder;
 
-    public function imperialMass(string $unit): FormatterBuilder;
+    public static function imperialMass(string $unit): FormatterBuilder;
 
-    public function date(string $format = 'Y-m-d H:i:s'): FormatterBuilder;
+    public static function date(string $format = 'Y-m-d H:i:s'): FormatterBuilder;
 
-    public function mask(string $range, string $replacement = '*'): FormatterBuilder;
+    public static function mask(string $range, string $replacement = '*'): FormatterBuilder;
 
-    public function metric(string $unit): FormatterBuilder;
+    public static function metric(string $unit): FormatterBuilder;
 
-    public function number(
+    public static function number(
         int $decimals = 0,
         string $decimalSeparator = '.',
         string $thousandsSeparator = ',',
     ): FormatterBuilder;
 
-    public function metricMass(string $unit): FormatterBuilder;
+    public static function metricMass(string $unit): FormatterBuilder;
 
-    public function pattern(string $pattern): FormatterBuilder;
+    public static function pattern(string $pattern): FormatterBuilder;
 
     /** @param array<string, mixed> $parameters */
-    public function placeholder(array $parameters): FormatterBuilder;
+    public static function placeholder(array $parameters): FormatterBuilder;
 
-    public function time(string $unit): FormatterBuilder;
+    public static function time(string $unit): FormatterBuilder;
 }